I Bought an OptiPlex 5040 MT desktop from Dell. I know that the pc has windows 7 pro pre-installed but there was a windows 10 pro recovery disk in my box, so I could update the system to the latest windows version. But after the upgrade my system did not find a MBR record and told me that my disc was protected....Here is my solution how to solve the problem.

Note you need the recovery disk! So the disk with the operation system on, not the drivers...

9 Steps total

Step 1: Check Bios

Open the bios of your system and change the bios in de UEFI mode.

Step 2: Restart with Operation system disc

Boot up with your system restore disc.

Step 3: choose

Choose Advanced options

Step 4: Choose

Choose Command Prompt

Step 5: Command Line

Execute following commands in Command Prompt at boot, press Enter key after each: